CN102128881B - Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition - Google Patents
Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition Download PDFInfo
- Publication number
- CN102128881B CN102128881B CN2010106000929A CN201010600092A CN102128881B CN 102128881 B CN102128881 B CN 102128881B CN 2010106000929 A CN2010106000929 A CN 2010106000929A CN 201010600092 A CN201010600092 A CN 201010600092A CN 102128881 B CN102128881 B CN 102128881B
- Authority
- CN
- China
- Prior art keywords
- signal
- damage
- lamb
- lamb wave
- under
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 235000019687 Lamb Nutrition 0.000 title claims abstract description 101
- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 10
- 230000004044 response Effects 0.000 claims abstract description 63
- 230000036541 health Effects 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims description 31
- 238000005086 pumping Methods 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 4
- 238000010606 normalization Methods 0.000 claims description 4
- 238000012806 monitoring device Methods 0.000 abstract 1
- 230000008859 change Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition, which comprises the following steps: collecting the Lamb wave healthy reference signals fhji of an engineering structure in a healthy state, wherein i and j can be 1, 2, 3,...; when the structure is damaged, collecting all the Lamb wave response signals f'ji of the damaged structure under the condition of an inspiring/sensing channel; utilizing the correlation operation to extract all the Lamb wave damage scattered signals of the damaged structure under the condition of the inspiring/sensing channel; obtaining the damage position and scope according to the characteristic parameters acquired in the steps above, thereby analyzing and judging the health condition of the monitored structure. According to the method, based on the condition of the traditional structural damage monitoring device, the Lamb wave damage scattered signals in a damage monitoring system are extracted by using the related treatment, thereby increasing the accuracy and stability of the monitoring system.
Description
Technical field
The present invention relates to the initiatively method of Lamb ripple damage monitoring of a kind of plate class engineering structure, relate in particular to Lamb wave structure damage scattered signal extraction in a kind of active health monitoring, thereby correctly realize the method for engineering structure damage monitoring.
Background technology
Along with to the improving constantly of safety of structure, reliability requirement, the on-line monitoring of structural damage causes people's great attention day by day with diagnosis, for disaster or the loss that prevents that structural damage from bringing, must effectively monitor plate structure.
The on-line monitoring requirement coherent signal generation and the collecting device of structural damage are simple relatively, and monitoring must have very high accuracy and real-time.The damage monitoring of plate structure generally adopts the initiatively method of Lamb ripple; Promptly at the driver and the sensor (like piezoelectric element) of body structure surface or inner integrated some; In addition; Whole monitoring system also comprises signal generation apparatus, power amplifier, signal amplifier and data acquisition equipment etc., when monitoring, at first in structure, encourages certain waveform, receives the scattering wave of response of structure and damage generation through sensor; Collect in the computing machine; Through the difference of response signal before and after the comparison structure damage, obtain the structural damage scattered signal, confirm the position and the scope of damage again according to information such as the due in that damages scattering wave, phase places by computer program.According to the Lamb theory of wave propagation, there are frequency dispersion and mode conversion in the communication process of Lamb ripple in plate structure, the velocity of propagation of the Lamb ripple signal of different frequency is also different.The Lamb scattering of wave signal energy that structural damage causes is generally all very little, and the Lamb ripple transmitting signal energy that in structure, encourages with driver often differs more than the one magnitude.And because the propagation of Lamb ripple in plate structure is non-directional; Therefore the method that mostly adopts at present structural damage front and back response signal directly to subtract each other is obtained Lamb ripple damage scattered signal; At this moment; The correct extraction of damage scattered signal will be directly disturbed in the influence that piezoelectric element, signal power amplifier and data acquisition equipment are changed by environment and self parameter, be easy to just produce deviation.This problem correct ground is analyzed the sonic propagation process and is extracted the characteristic parameter that damages scattered signal and brought difficulty; Especially in compound substance plate structure damage monitoring; Because Lamb ripple signal is propagated complicated, structure is very fast to signal absorption, makes this problem become complicated more.For example: Flight Vehicle Structure has adopted a large amount of compound substances at present, and structure is all very complicated, the online damage monitoring of exploratory flight device structure, at first correct extraction damage scattered signal.Therefore, must analyze the signal propagation law of Lamb ripple, correct extraction Lamb ripple damage scattered signal extracts and damages relevant characteristic parameter guaranteeing, guarantees authenticity, validity and the stability of monitoring result.
Based on above consideration, the inventor studies improvement to existing structural damage scattered signal method for distilling, and this case produces thus.
Summary of the invention
Technical matters to be solved by this invention is to defective and deficiency in the above-mentioned background technology; A kind of Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition is provided; It uses sensing/excitation array technique; On existing structure damage monitoring appointed condition basis, adopt the extraction of Lamb ripple damage scattered signal in the relevant treatment realization damage monitoring system, improve the accuracy and the stability of monitoring system.
The present invention is for solving the problems of the technologies described above, and the technical scheme of employing is:
A kind of Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition comprises the steps:
(1) arranges that on engineering structure to be monitored one group of piezoelectric element forms sensing/excitation array, wherein, be made as as the piezoelectric element of exciting element
P j , be made as as the piezoelectric element of sensing element
P i , wherein
I, j=1,2,3,
(2) gather the healthy reference signal of engineering structure Lamb ripple under all excitation/sensing passages under structural health conditions
Fh Ji , wherein
I, j=1,2,3,
(3) when damage takes place structure, gather the Lamb wave response signal behind the structural damage under all excitation/sensing passages
F ' Ji , wherein
I, j=1,2,3,
(4) extract the damage of the Lamb ripple behind structural damage scattered signal under all excitation/sensing passages, particular content is:
(41) with the healthy reference signal of the Lamb ripple that obtains in the step (2)
Fh Ji With Lamb wave response signal behind the structural damage that obtains in the step (3)
F ' Ji Make computing cross-correlation, obtain the peak value moment of operation result
t Ji With the peak value size
U Ji , and with the peak value size
U Ji Divided by
Fh Ji The auto-correlation peak value, obtain the amplitude size of the healthy reference signal of Lamb ripple
u Ji
(42) with the healthy reference signal of Lamb ripple
Fh Ji Corresponding amplitude with it
u Ji Multiply each other, obtain the health signal part in the Lamb wave response signal behind the structural damage
Fh ' Ji
(43) with Lamb wave response signal behind the structural damage
F ' Ji Time series be benchmark, and with the moment under this sequence reference time
t Ji Be signal
Fh ' Ji The zero hour, according to corresponding moment point, with Lamb wave response signal behind the structural damage
F ' Ji With signal
Fh ' Ji Correspondence is subtracted each other, and obtains Lamb wave structure damage scattered signal
Fd Ji
(5), draw the position and the scope of damage, thereby analyze, judge the health condition of monitored structure according to the resulting characteristic parameter of abovementioned steps.
The detailed step of above-mentioned steps (2) is:
(21) under structural health conditions, be loaded into Lamb ripple ultrasonic signal as exciting element through function generator and power amplifier
P j On, in structure, excite pumping signal;
(22) choose each piezoelectric element successively
P i As sensing element, wherein
i=1,2,3 ..., will through charge amplifier
P j Lamb wave structure response signal sensing under the excitation, amplification are also gathered in the entering control computer, obtain the Lamb wave response signal under structural health conditions under all excitation/sensing passages
f Ji , wherein
I, j=1,2,3,
(23) to aforementioned each Lamb wave response signal
f Ji , wherein
I, j=1,2,3 ..., carry out normalization respectively according to its peak value size and handle, obtain the healthy reference signal of Lamb ripple
Fh Ji , wherein
I, j=1,2,3 ...
In the above-mentioned steps (21), described pumping signal is a narrow band signal.
The detailed step of above-mentioned steps (3) is:
(31) when damage takes place structure, be loaded into Lamb ripple ultrasonic signal as exciting element through function generator and power amplifier
P j On, in structure, excite the arrowband pumping signal;
(32) choose each piezoelectric element successively
P i As sensing element, wherein
i=1,2,3 ..., will through charge amplifier
P j Lamb wave structure response signal sensing under the excitation, amplification are also gathered in the entering control computer, obtain the Lamb wave response signal when structural damage under all excitation/sensing passages
F ' Ji , wherein
I, j=1,2,3 ...
After adopting such scheme, the ultimate principle that the present invention used is: after having confirmed frequently thick amassing, the propagation characteristic of Lamb ripple transmitting signal is definite basically, and parameters such as its speed are also just confirmed.The damage that occurs in the structure for the Lamb ripple is propagated, is a scatterer, can carry out scattering to Lamb ripple transmitting signal.Difference before and after the structural damage has been exactly more damages this scatterer, therefore, for Lamb wave structure response signal, has promptly comprised the response signal under the structural health conditions in the response signal behind the structural damage, has comprised the scattered signal that damage causes again.The source of this two parts of signals with take place constantly differently, and the former energy is than big many of the latter.When environment or device parameter change; For example temperature variation will inevitably cause the variation of response signal amplitude, but can't change the propagation law of Lamb ripple signal; The relative moment and the crest that are each ripple bag in the response signal can not change, and variation has taken place the amplitude that is whole signal.Adopt the Lamb wave response signal under the structural health conditions this moment is reference signal; Carry out related operation with the structural response signal after the damage; According to the rule of related operation, the result of related operation representes the degree of correlation of two groups of signals, reference signal with the damage after the structural response signal in healthy response signal part actual be to make auto-correlation computation; Relevant fully; Its correlation is maximum, thus the moment that maximum related value occurs must be going out now of healthy response signal part, the peaked ratio of auto-correlation of maximum related value and reference signal is the amplitude of healthy response signal simultaneously.And then healthy response signal part in the structural response signal after obtaining damaging, according to correspondence constantly, promptly obtained the Lamb scattering of wave signal that damage causes after this part signal deducted.The present invention can eliminate environment effectively and variation in plant parameters is extracted the interference that brings to Lamb ripple damage scattered signal, helps promoting the promotion and application of structural health monitoring technology.
Description of drawings
Fig. 1 is the schematic layout pattern of sensing among the present invention/excitation array;
Fig. 2 is the waveform time-domain diagram of arrowband pumping signal among the present invention;
Fig. 3 a is the Lamb wave response signal waveforms under structural health conditions under the narrow band signal shown in Figure 2 excitation under a certain passage among the present invention;
Fig. 3 b carries out the oscillogram after the normalization to signal shown in Fig. 3 a;
Fig. 4 be among the present invention under a certain passage under narrow band signal shown in Figure 2 excitation the Lamb wave response signal waveforms during structural damage;
Fig. 5 be the Lamb wave structure response signal behind the structural damage shown in pumping signal, Fig. 3 a and Fig. 3 a with structural damage shown in Figure 4 before and after the direct corresponding contrast synoptic diagram that subtracts each other between the difference signal three who obtains of Lamb wave response signal;
Fig. 6 a is the waveform synoptic diagram that among the present invention signal shown in Fig. 4 and Fig. 3 b is carried out computing cross-correlation;
Fig. 6 b is the structural health conditions response signal amplitude and the generation moment that from related operation structure shown in Fig. 6 a, obtains;
Fig. 6 c is after the response signal under the structural health conditions that comprises in the structural response signal of damage back is separated and the contrast situation of original signal;
Fig. 7 is the synoptic diagram that adopts the Lamb ripple damage scattered signal that the present invention obtains.
Embodiment
Below will combine accompanying drawing that implementation procedure of the present invention is elaborated.
The present invention provides a kind of Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition, comprises the steps:
(1) arranges that on engineering structure to be monitored one group of piezoelectric element forms sensing/excitation array, wherein, be made as as the piezoelectric element of exciting element
P j , be made as as the piezoelectric element of sensing element
P i , and
I, j=1,2,3,
In the present embodiment, cooperate shown in Figure 1ly, get
i=1,2,
j=1, these 3 piezoelectric elements all are fixed on the test specimen, and described test specimen is an epoxy glass fiber reinforced composite plate, is of a size of 800mm * 200mm * 2mm; 3 piezoelectric elements are arranged in a linear, and are true origin with the central point of test specimen, and the coordinate of 3 piezoelectric element A, B, C is respectively (50mm; 0mm), (0mm, 0mm), (50mm, 0mm); In the present embodiment, adopt piezoelectric element A as exciting element, two other piezoelectric element B, C are as sensing element; Type of impairment is selected typical through hole damage, among the embodiment at coordinate be (0mm, 35mm) hole of an about 4mm of diameter is got in the position with electric drill; The response signal under the two states of damage front and back is gathered and is analyzed in the damage of formation through hole respectively;
(2) gather the following Lamb ripple health reference signal of structural health conditions (
Fh Ji ), its detailed content is:
(21) under structural health conditions, be loaded into Lamb ripple ultrasonic signal as exciting element through function generator and power amplifier
P j On (also being piezoelectric element A), in structure, excite the arrowband pumping signal, in the present embodiment, described arrowband pumping signal is a sinusoidal modulation signal, and centre frequency is 30KHZ, and is as shown in Figure 2;
(22) choose each piezoelectric element successively
P i (
i=1,2) as sensing element, will through charge amplifier
P j Excitation Lamb wave structure response signal sensing, amplification down also gathered in the entering control computer, obtain the Lamb wave response signal under structural health conditions under all excitation/sensing passages (
f Ji ) (
I, j=1,2,3 ...), promptly show like Fig. 3 a
j=1,
iLamb wave response signal under the structural health conditions that collected in=2 o'clock (
f 12);
(23) to aforementioned each Lamb wave response signal (
f Ji ) (
I, j=1,2,3 ...), carry out normalization respectively according to its peak value size and handle, obtain signal (
Fh Ji ) (
I, j=1,2,3 ...), be the healthy reference signal of Lamb ripple,
j=1,
iThe healthy reference signal of=2 o'clock Lamb ripple can be shown in Fig. 3 b;
(3) when damage takes place in structure, repeating step (21)～(22), obtain the Lamb wave response signal behind the structural damage under all excitation/sensing passages (
F ' Ji ) (
I, j=1,2,3 ...), its detailed content is:
(31) when damage takes place structure, be loaded into Lamb ripple ultrasonic signal as exciting element through function generator and power amplifier
P j On, in structure, excite the arrowband pumping signal;
(32) choose each piezoelectric element successively
P i (
i=1,2,3 ...) as sensing element, will through charge amplifier
P j Excitation Lamb wave structure response signal sensing, amplification down also gathered in the entering control computer, obtain the Lamb wave response signal when structural damage under all excitation/sensing passages (
F ' Ji ) (
I, j=1,2,3 ...),
j=1,
i=2 o'clock signal (
F ' 12) as shown in Figure 4;
Fig. 4 and Fig. 3 a are compared and can know, because longer with the following signal interval time of gathering of structural health conditions, change (like temperature) has taken place in environmental parameter; Thereby influenced the parameter of sensing element and amplifier, on the amplitude of signal, had deviation, specifically; The system noise signal that collect early stage is suitable, and significant change does not take place, and this parameter that shows acquisition system does not change; And all there be reducing to a certain degree in the amplitude of response signal; According to the position relation of damage with excitation/sensor array, the damage scattered signal can not have influence on main crest amplitude, so response signal can't directly be subtracted each other before and after the structural damage that obtains under this situation.
On the other hand, as shown in Figure 5, be with the Lamb wave response signal before and after the Lamb wave structure response signal behind the structural damage shown in pumping signal, Fig. 3 a and Fig. 3 a and the structural damage shown in Figure 4 (
f 12 ) with (
F ' 12 ) subtract each other the situation that the difference signal that obtains compares; As can be seen from the figure; The waveform of difference signal is basic identical with damage back structural response signal; Therefore the difference signal of this moment in fact mainly is because the deviation that piezoelectric patches and amplification system parameter change and cause can not reflect correctly that the signal that damage causes changes.
(4) extract the damage of the Lamb ripple behind structural damage scattered signal under all excitation/sensing passages, still with P
1Be excitation, P
2The signal of gathering during for sensing is an example, and particular content is:
(41) with the healthy reference signal of the Lamb ripple that obtains in the step (2) (
Fh 12 ) with step (3) in Lamb wave response signal behind the structural damage that obtains (
F ' 12 ) make computing cross-correlation, obtain the peak value moment of operation result
t 12 With the peak value size
U 12 , shown in Fig. 6 a, and with the peak value size
U 12 Divided by (
Fh 12 ) the auto-correlation peak value, obtain the amplitude size of the healthy reference signal of Lamb ripple
u 12 , can be with reference to shown in the figure 6b;
Repeat said process and obtain all
j,
iValue
t Ji With
u Ji
(42) with the healthy reference signal of Lamb ripple (
Fh 12 ) corresponding amplitude with it
u 12 Multiply each other, obtain the part of the health signal in the Lamb wave response signal behind the structural damage (
Fh ' 12 ), cooperate shown in Fig. 6 c, should (
Fh ' 12 ) and original signal (
F ' 12 ) compare and can find out, the main crest of structural response signal is suitable basically before and after the damage, has eliminated environmental parameter and has changed the influence that brings;
(43) with Lamb wave response signal behind the structural damage (
F ' 12 ) time series be benchmark, and with the moment under this sequence reference time
t Ji For signal (
Fh ' 12 ) the zero hour, according to corresponding moment point, with Lamb wave response signal behind the structural damage (
F ' 12 ) and signal (
Fh ' 12 ) correspondence subtracts each other, obtain Lamb wave structure damage scattered signal (
Fd 12 ), to see shown in Figure 7ly, damage scattered signal ripple bag reveal this moment;
Repeat said process, obtain all
j,
iThe damage scattered signal of value (
Fd Ji ).
(5) according to the resulting characteristic parameters such as scattered signal ripple bag due in, phase place that respectively damage of abovementioned steps; Draw position and the scope (can adopt methods such as oval localization method, time reversal imaging method) of damage, thereby analyze, judge the health condition of monitored structure.
Need to prove; Number as the piezoelectric element of excitation/sensor array; Can confirm that 3 piezoelectric elements just can be formed a monitoring means in theory according to actual condition of structure to be monitored, according to circumstances can form sensing network when structure is big through arranging a plurality of piezoelectric elements; Adopt the mode of scanning to carry out, the monitoring concrete steps of each unit are identical in the network.
In sum, method provided by the present invention has the following advantages:
(1) improved accuracy, helped the practicability of this technology based on the structure damage monitoring method of active Lamb wave technology;
(2) method of the present invention makes environmental parameter be able to eliminate to the influence of monitoring system and excitation/sensor array, and system need not preheating and can measure in the observation process, has improved real-time;
(3) method of the present invention need not change or increase equipment and parameter in implementation procedure, utilizes the existing hardware system just can realize;
(4) implementation method of the present invention is simple, need not to know the priori of monitoring target and sensor array, just handles to the response signal before and after the structural damage.
Above embodiment is merely explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of on the technical scheme basis, being done all falls within the protection domain of the present invention.
Claims (4)
1. a Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition is characterized in that comprising the steps:
(1) arranges that on engineering structure to be monitored one group of piezoelectric element forms sensing/excitation array, wherein, be made as P as the piezoelectric element of exciting element
j, be made as P as the piezoelectric element of sensing element
i, i wherein, j=1,2,3,
(2) gather the healthy reference signal fh of engineering structure Lamb ripple under all excitation/sensing passages under structural health conditions
Ji, i wherein, j=1,2,3,
(3) when damage takes place structure, gather the Lamb wave response signal f ' behind the structural damage under all excitation/sensing passages
Ji, i wherein, j=1,2,3,
(4) extract the damage of the Lamb ripple behind structural damage scattered signal under all excitation/sensing passages, particular content is:
(41) with the healthy reference signal fh of the Lamb ripple that obtains in the step (2)
JiWith Lamb wave response signal f ' behind the structural damage that obtains in the step (3)
JiMake computing cross-correlation, obtain the peak value moment t of operation result
JiWith peak value size U
Ji, and with peak value size U
JiDivided by fh
JiThe auto-correlation peak value, obtain the amplitude size u of the healthy reference signal of Lamb ripple
Ji
(42) with the healthy reference signal fh of Lamb ripple
JiCorresponding amplitude u with it
JiMultiply each other, obtain the health signal part fh ' in the Lamb wave response signal behind the structural damage
Ji
(43) with Lamb wave response signal f ' behind the structural damage
JiTime series be benchmark, and with the moment t under this sequence reference time
JiBe signal fh '
JiThe zero hour, according to corresponding moment point, with Lamb wave response signal f ' behind the structural damage
JiWith signal fh '
JiCorrespondence is subtracted each other, and obtains Lamb wave structure damage scattered signal fd
Ji
(5) according to the resultant Lamb wave structure damage of abovementioned steps scattered signal fd
JiCharacteristic parameter, draw the position and the scope of damage, thereby analyze, judge the health condition of monitored structure.
2. the Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition as claimed in claim 1, it is characterized in that: the detailed step of said step (2) is:
(21) under structural health conditions, Lamb ripple ultrasonic signal is loaded into the P as exciting element through function generator and power amplifier
jOn, in structure, excite pumping signal;
(22) choose each piezoelectric element P successively
iAs sensing element, i=1 wherein, 2,3 ..., through charge amplifier with P
jLamb wave structure response signal sensing under the excitation, amplification are also gathered in the entering control computer, obtain the Lamb wave response signal f under structural health conditions under all excitation/sensing passages
Ji, i wherein, j=1,2,3,
(23) to aforementioned each Lamb wave response signal f
Ji, i wherein, j=1,2,3 ..., carry out normalization respectively according to its peak value size and handle, obtain the healthy reference signal fh of Lamb ripple
Ji, i wherein, j=1,2,3 ...
3. the Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition as claimed in claim 2, it is characterized in that: in the said step (21), described pumping signal is a narrow band signal.
4. the Lamb ripple engineering structure damage monitoring method of utilizing signal decomposition as claimed in claim 1, it is characterized in that: the detailed step of said step (3) is:
(31) when damage takes place structure, Lamb ripple ultrasonic signal is loaded into the P as exciting element through function generator and power amplifier
jOn, in structure, excite the arrowband pumping signal;
(32) choose each piezoelectric element P successively
iAs sensing element, i=1 wherein, 2,3 ..., through charge amplifier with P
jLamb wave structure response signal sensing under the excitation, amplification are also gathered in the entering control computer, obtain the Lamb wave response signal f ' when structural damage under all excitation/sensing passages
Ji, i wherein, j=1,2,3 ...
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106000929A CN102128881B (en) | 2010-12-22 | 2010-12-22 | Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106000929A CN102128881B (en) | 2010-12-22 | 2010-12-22 | Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102128881A CN102128881A (en) | 2011-07-20 |
| CN102128881B true CN102128881B (en) | 2012-06-27 |
Family
ID=44267046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106000929A Expired - Fee Related CN102128881B (en) | 2010-12-22 | 2010-12-22 | Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102128881B (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967656A (en) * | 2012-11-09 | 2013-03-13 | 南京邮电大学 | Method for detecting crack damage of engineering structure by using Lamb wave energy transmission attenuation spectrum |
| CN102998370A (en) * | 2012-12-14 | 2013-03-27 | 南京邮电大学 | Monitoring method for time reversal damage to no-datum Lamb wave of engineering structure |
| CN103134857B (en) * | 2013-02-21 | 2015-09-02 | 南京邮电大学 | Utilize the engineering structure Crack Damage monitoring and assessing method of Lamb wave mirror field |
| CN103472142A (en) * | 2013-09-10 | 2013-12-25 | 河海大学 | Active damage monitoring device and method for hydraulic concrete structure |
| CN104698080A (en) * | 2013-12-06 | 2015-06-10 | 中国飞机强度研究所 | Method for performing state monitoring on structural damages by using Lamb waves |
| CN104330471B (en) * | 2014-10-09 | 2017-01-18 | 南京航空航天大学 | Lamb wave time-varying probability model monitoring method for aviation structure damage |
| CN105784853B (en) * | 2016-04-14 | 2018-06-08 | 苏州泛能电力科技有限公司 | A kind of engineering structure directionality damage active monitoring and appraisal procedure |
| CN106645401B (en) * | 2016-10-19 | 2019-07-16 | 南京航空航天大学 | A kind of damage reason location and reconstructing method and system based on the estimation of frequency wave number |
| CN106990170B (en) * | 2017-04-19 | 2019-05-17 | 南京邮电大学 | A kind of signal conformance compensation method in piezoelectric-array Lamb wave damage monitoring |
| CN107144643B (en) * | 2017-06-15 | 2019-11-08 | 南京邮电大学 | A kind of damnification recognition method of Lamb wave monitoring signals statistical parameter |
| CN107796871A (en) * | 2017-08-24 | 2018-03-13 | 中国人民解放军空军勤务学院 | Lamb wave transducing signal length compensation method based on cross-correlation |
| CN108169327B (en) * | 2017-12-14 | 2019-04-05 | 南京航空航天大学 | MUSIC corrosion monitoring process based on excitation beam forming and weighted image fusion |
| CN110389170B (en) * | 2018-04-17 | 2023-03-24 | 江苏必得科技股份有限公司 | Train component crack damage detection method and system based on Lamb wave imaging |
| CN109990968B (en) * | 2019-03-22 | 2021-01-05 | 西北核技术研究所 | Plate structure impact positioning method based on time reversal method principle |
| CN110333288A (en) * | 2019-06-17 | 2019-10-15 | 西安交通大学 | A kind of delamination damage imaging method of the double-level-metal composite plate based on boundary wave |
| CN110687196A (en) * | 2019-08-26 | 2020-01-14 | 天津大学 | System and method for detecting lamb wave action effect of plate-shaped structure reinforcing rib |
| CN110702785B (en) * | 2019-09-24 | 2020-10-16 | 清华大学 | Method and device for time-frequency domain modal decomposition and defect positioning of frequency dispersion Lamb wave polynomial |
| CN111175379B (en) * | 2020-01-21 | 2022-08-02 | 南京邮电大学 | Lamb wave plate structure health monitoring method based on synchronous compression wavelet transform |
| CN113155971A (en) * | 2021-03-22 | 2021-07-23 | 南京信息职业技术学院 | Guided wave double-point sensing pipeline structure damage detection method |
| CN113804765A (en) * | 2021-10-08 | 2021-12-17 | 金陵科技学院 | Method and system for positioning multiple damage areas of seal head part of pressure vessel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1685457A2 (en) * | 2003-09-22 | 2006-08-02 | Kim Hyeung-Yun | Methods for monitoring structural health conditions |
| CN100580445C (en) * | 2007-10-12 | 2010-01-13 | 南京航空航天大学 | Engineering structure damage active monitoring Lamb wave time-reversal focusing method |
| CN101839893B (en) * | 2010-05-10 | 2012-06-27 | 中国人民解放军理工大学 | Lamb wave virtual time reversal method with high spatial resolution |
-
2010
- 2010-12-22 CN CN2010106000929A patent/CN102128881B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN102128881A (en) | 2011-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102128881B (en) | Method for monitoring Lamb wave engineering structural damage by utilizing signal decomposition | |
| CN100580445C (en) | Engineering structure damage active monitoring Lamb wave time-reversal focusing method | |
| CN102323337B (en) | Method for actively monitoring damage of engineering structure excited by adopting synthesis wave front | |
| CN102998370A (en) | Monitoring method for time reversal damage to no-datum Lamb wave of engineering structure | |
| CN103575523A (en) | Rotating machine fault diagnosis method based on Fast ICA-spectrum kurtosis-envelope spectrum analysis | |
| Wodecki et al. | Process Monitoring in Heavy Duty Drilling Rigs—Data Acquisition System and Cycle Identification Algorithms | |
| CN110529087B (en) | Method and device for evaluating hydraulic fracturing effect of stratum | |
| Han et al. | The fault feature extraction of rolling bearing based on EMD and difference spectrum of singular value | |
| CN103760243A (en) | Microcrack nondestructive testing device and method | |
| CN101874744B (en) | Ultrasonic guided wave parameter measurement method used for long bone analysis | |
| CN104502451A (en) | Method for identifying flaw of steel plate | |
| CN101458158A (en) | Steam turbine plain bearing failure diagnosis method based on acoustic emission detection and device thereof | |
| CN102928472A (en) | Monitoring method for blade crack of wind driven generator | |
| CN102262700B (en) | Product service life prediction method for pre-processing degradation data based on wavelet analysis | |
| CN104034407A (en) | Method for reducing periodic error in rotating machinery torsional vibration signal pulse measuring method | |
| CN107687941A (en) | A kind of high-pressure diaphragm pump check valve Incipient Fault Diagnosis method based on analysis of vibration signal | |
| Li et al. | Acoustic emission signal source localization on plywood surface with cross-correlation method | |
| Wang et al. | An order tracking-free method for variable speed fault diagnosis based on adaptive chirp mode decomposition | |
| CN104698080A (en) | Method for performing state monitoring on structural damages by using Lamb waves | |
| CA2924938C (en) | Method and device for increasing frequency of seismic digital signal | |
| CN105943183B (en) | Infrared thermal wave imaging detection device based on heterodyne method | |
| CN108107437A (en) | A kind of marine environmental monitoring method using normal mode coupling interference | |
| CN105116056A (en) | Acoustic emission positioning system and method based on FBG sensing system and second order statistic | |
| CN203259503U (en) | Ultrasonic transit time measurement system for lesion detection | |
| CN104011497A (en) | Information signal generating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Qiang Inventor after: Yue Dong Inventor after: Yuan Shenfang Inventor after: Chen Xiaohui Inventor after: Jiang Bing Inventor before: Wang Qiang Inventor before: Yuan Shenfang Inventor before: Chen Xiaohui Inventor before: Jiang Bing |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180123 Address after: 210003 Gulou District, Jiangsu, Nanjing new model road, No. 66 Patentee after: Nanjing University of Posts and Telecommunications Asset Management Co.,Ltd. Address before: 210003 Nanjing City, Jiangsu Province, the new model road No. 66 Patentee before: NANJING University OF POSTS AND TELECOMMUNICATIONS |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180528 Address after: 215626 room 801, 8 / F, Hexing Sha Chau building, Jin Fengzhen, Zhangjiagang, Suzhou, Jiangsu. Patentee after: JIANGSU NANYOU SMART CITY RESEARCH INSTITUTE CO.,LTD. Address before: 210003 new model road 66, Gulou District, Nanjing, Jiangsu Patentee before: Nanjing University of Posts and Telecommunications Asset Management Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120627 |